单项选择题

Hot air accompanied by high relative humidity feels warmer than().

A．it actually is
B．actually it is
C．is it actually
D．is actually it

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单项选择题
He is a scientist, () a singer as well.

A．not
B．or
C．and
D．but
单项选择题
()is a good form of exercise for both young and old.

A．Walking
B．To walk
C．The walk
D．Walk
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